The only reason tetra-ethyl lead was added to gasoline was it was the cheapest way known to increase the octane level of gasoline which the higher compression engines needed to prevent pre-ignition. It had nothing, NOTHING, to do with protecting valve seats. That might have been an advertising claim, but it was all about increasing octane. AMOCO sold theitr ''white gas'' which was a highly refined gasoline that was as clear as water, high octane, and no lead, but it was expensive. I understand that they're refining it again at their refineries in Texas and Virginia and it will soon be available at their midwest stations. I remember when a lot of the aircraft the military flew were powered by reciprocating gasoline engines. The military decided to go to one grade of fuel in everything. Because some of the big stuff required 115/145 avgas that became the gas used in everything. US government contracts go to the lowest bidder. Lowest bidder had to use lead to achieve 115 octane. That fuel had so much lead in it it would turn our fingers white when we took fuel samples. Which was every day. Some of the aircraft didn't need high octane. One of them was a Hiller helicopter that required 87 octane. That particular helicopter used engine oil to lubricate the transmission. The engine oil, after using the new 115 octane fuel, started leaving lead deposits in the transmission. The first thing that failed was the Borg-Warner over-running clutch, which made auto-rotation possible. The entire fleet of Hiller helicopters had to be grounded and a seperate transmission lubrication system installed. The lead deposits were fowling the clutches with a gray, gloppy substance. These old tractor engines came out when low octane fuels were the norm. They didn't need any lead then and they don't need any lead now.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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